If you are going to join the debate, at least be serious.
Hillary will never become a Republican so your point is invalid.
However, for the sake of argument, if Hillary was running for senator as a Republican (in a state I was allowed to vote in) I would vote for her.
Why you may ask? The way the rules are in congress, the polictical parties control who is in charge. Individuals are assigned duties according to which party is currently in charge. If voting for Hillary would mean the difference between the Republicans in charge as opposed to Democrats, I would hold my nose and vote for her.
Do I like this system, no, but it is what it is.
Karl Marx would be proud.